Correct Answer: A

Rationale: To calculate the mL to administer, use the formula: Dose required (mg) · Stock concentration (mg/mL) = Volume to administer (mL). In this case, 10 mg · 40 mg/mL = 0.25 mL. However, when rounding to the nearest tenth, the answer should be 0.3 mL. Therefore, the nurse should administer 0.3 mL. Choice A is the correct answer. Choice B (0.25 mL) is the result obtained before rounding. Choice C (0.4 mL) and Choice D (0.5 mL) are incorrect calculations.

Correct Answer: B

Rationale: The correct answer is B: Droplet. Droplet precautions are required for infections that spread via droplets larger than 5 microns in diameter, such as pharyngeal diphtheria. Contact precautions are used for diseases that spread by direct or indirect contact. Airborne precautions are for diseases that spread through small particles in the air. Protective precautions are not a standard precautionary measure for specific infections like pharyngeal diphtheria.

Correct Answer: B

Rationale: Drawing up insulin after warming the vial to room temperature indicates a need for further teaching, as insulin should be at room temperature for administration. Choice A is correct as rotating injection sites helps prevent lipodystrophy. Choice C is correct as pinching the skin helps ensure proper subcutaneous injection. Choice D is correct as injecting insulin at a 90-degree angle is the recommended technique for subcutaneous injections.

Correct Answer: B

Rationale: Auscultating lung sounds is crucial for assessing the extent of congestion in a client with CHF. The presence of crackles or wheezing can indicate fluid accumulation in the lungs, a common complication of CHF. Monitoring urine output (Choice A) is important to assess renal function but is not the priority in this situation. While assessing the apical pulse (Choice C) and checking blood pressure (Choice D) are important in managing CHF, they do not provide immediate information about the respiratory status and congestion level in the lungs, making auscultating lung sounds the most critical assessment.

Correct Answer: A

Rationale: The correct answer is A, Acupuncture. Acupuncture is contraindicated for clients with herpes zoster due to the risk of infection at the needle sites. In individuals with herpes zoster, the skin's integrity is compromised, increasing susceptibility to infections. Therefore, acupuncture, which involves inserting needles into the skin, can introduce pathogens and lead to local infections. Massage therapy (B), aromatherapy (C), and herbal supplements (D) do not involve skin penetration like acupuncture and are generally considered safe complementary therapies for pain control in clients with herpes zoster.